不断加强我军政治优势建设

优势原则是军事斗争最基本、最古老的法则。追求和夺取优势,是任何一支军队进行军事斗争准备和实践的直接目标。拥有了优势,也就拥有了更多赢得战争的砝码。一旦发生战事,就能以优击劣,稳操胜券。中国人民解放军在80年的革命和建设实践中,形成了独特的政治优势。     

Experimental investigation on weak shock wave mitigation characteristics of flexible polyurethane foam and polyurea

In recent years, explosion shock wave has been considered as a signature injury of the current military conflicts. Although strong shock wave is lethal to the human body, weak shock wave can cause many more lasting consequences. To investigate the protection ability and characteristics of flexible materials and structures under weak shock wave loading, the blast wave produced by TNT explosive is loaded on the polyurethane foam with the density of 200.0 kg/m3(F-200) and 400.0 kg/m3(F-400), polyur...     

2013—2015年BDS空间信号测距误差的精度评估

基于武汉大学发布的精密星历，计算2013年1月至2015年9月北斗广播星历的轨道、钟差和空间信号测距误差，并对其进行统计分析评估。结果表明：北斗卫星的径向精度总体上优于0.7 m、法向精度总体上优于1.4 m，且无明显的长期变化趋势；在切向精度上，倾斜地球同步轨道和中轨道优于2.1 m，高轨道的切向精度已从14 m左右提升至8 m左右；北斗高轨道、倾斜地球同步轨道、中轨道的钟差精度分别为6.3 ns, 4.7 ns, 4.3 ns；所有卫星的钟差精度总体上优于6 ns；所有卫星的空间信号误差精度总体上优于2 m，从长期来看，中轨道卫星的空间信号误差精度较为稳定；倾斜地球同步轨道和高轨道卫星的空间信号误差精度存在一定的波动。     

基于FAHP法的多管火箭武器系统效能评估

为了对多管火箭武器系统作战效能进行评估,基于模糊层次分析法理论(FAHP)和熵权理论,建立了多管火箭武器系统作战效能评估的递阶层次分析结构模型.通过性能指标中两两元素相对比较技术,结合三角模糊数来建立模糊判断矩阵.根据水平截集和乐观指标,进行模糊区间的运算,得出熵权,根据熵权大小选出了效能理想的方案.该方法具有一定的工程应用价值,对评价火箭武器系统作战效能提供了分析依据.     

基于兰彻斯特方程的大区域防空作战效能评估模型

针对大区域防空参战兵力多,体系结构、交战过程复杂的特点,引入作战效能、战斗编组、火力毁伤及任务分配等矩阵,建立了基于兰彻斯特方程的大区域防空作战效能评估模型,包括战斗力指数、战斗编组、毁伤指数、任务分配、指挥控制和作战实力损耗等部分。每个模型的建立均通过设定相应矩阵,分析战斗力指数,得出其计算模型。并以相关抗击率以及安全率表征总体效能指标,较好地解决了对大区域防空作战效能的评估问题。模型简洁,便于理解,易于计算。     

Partial penetration of annular grooved projectiles impacting ductile metal targets

Changing and optimizing the projectile nose shape is an important way to achieve specific ballistic performance. One special ballistic performance is the embedding effect, which can achieve a delayed high-explosive reaction on the target surface. This embedding effect includes a rebound phase that is significantly different from the traditional penetration process. To better study embedment behavior, this study proposed a novel nose shape called an annular grooved projectile and defined its interaction process with the ductile metal plate as partial penetration. Specifically, we conducted a series of low-velocity-ballistic tests in which these steel projectiles were used to strike 16-mm-thick target plates made with 2024-O aluminum alloy. We observed the dynamic evolution characteristics of this aluminum alloy near the impact craters and analyzed these characteristics by corresponding cross-sectional views and numerical simulations. The results indicated that the penetration resistance had a brief decrease that was influenced by its groove structure, but then it increased significantly-that is, the fluctuation of penetration resistance was affected by the irregular nose shape. Moreover, we visualized the distribution of the material in the groove and its inflow process through the rheology lines in microscopic tests and the highlighted mesh lines in simulations. The combination of these phenomena revealed the embed-ment mechanism of the annular grooved projectile and optimized the design of the groove shape to achieve a more firm embedment performance. The embedment was achieved primarily by the target material filled in the groove structure. Therefore, preventing the shear failure that occurred on the filling material was key to achieving this embedding effect.     

注水角度对同心筒发射装置降温影响研究

针对某新型同心筒发射过程中存在的热载荷问题,采用筒底持续注水方式对发射装置进行降温,可以有效降低发射过程中燃气对发射装置的热冲击作用。计算中采用RNG k-ε湍流模型和mixture多相流模型求解气液两相流场,建立了考虑导弹运动的三维同心筒发射燃气射流冲击模型,对不同注水角度的湿式同心筒发射装置热物理场进行了分析研究。结果表明,当注水角度为30°时,发射装置内筒外壁面和外筒内壁面的温度最低,燃气对发射装置的热冲击最小。研究结果可为同心筒降温装置设计提供参考。